Chapter08-UserInteractivity.pdf

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X3D Graphics for Web Authors
Chapter 8
User Interactivity
Nobody knows the kind of trouble we're in.
Nobody seems to think it all might happen again.
Gram Parsons, “One Hundred Years from Now”
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Contents
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Chapter Overview
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Overview: User Interactivity
User interactivity is initiated via sensor nodes,
which capture user inputs and are hooked up
to provide appropriate responses
TouchSensor senses pointing device (mouse, etc.)
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PlaneSensor is a drag sensor that converts x-y
pointer motion to move objects in a plane
•
CylinderSensor and SphereSensor are drag sensors
that convert x-y pointer motion to rotate objects
•
KeySensor and StringSensor capture keyboard input
•
Interactivity sensors initiate animation chains
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Related nodes
Chapter 4, Viewing and Navigation nodes
Anchor: pointing device
•
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Selects another Viewpoint or loads another scene
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Show description when pointing device is over geometry
Billboard rotates child geometry to face user
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Collision reports if viewer collides with geometry
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Chapter 12, Environment Sensor and Sound
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LoadSensor reports when media asset is loaded
ProximitySensor reports when user is in vicinity
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VisibilitySensor indicates when user's current
camera view can see sensed geometry
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